/*
 * Created on 18-Jan-2006
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.aelitis.azureus.core.networkmanager.impl;

import java.util.ArrayList;
import java.util.List;

import org.gudy.azureus2.core3.logging.LogEvent;
import org.gudy.azureus2.core3.logging.LogIDs;
import org.gudy.azureus2.core3.logging.Logger;
import org.gudy.azureus2.core3.util.AEMonitor;
import org.gudy.azureus2.core3.util.SimpleTimer;
import org.gudy.azureus2.core3.util.SystemTime;
import org.gudy.azureus2.core3.util.TimerEvent;
import org.gudy.azureus2.core3.util.TimerEventPerformer;

public abstract class ProtocolDecoder {
    private static final LogIDs LOGID = LogIDs.NWMAN;

    private static final int TIMEOUT_CHECK = 5000;
    private static final int LOG_TICKS = 60000 / TIMEOUT_CHECK;

    private static List<ProtocolDecoder> decoders = new ArrayList<ProtocolDecoder>();

    private static AEMonitor class_mon = new AEMonitor("TCPProtocolDecoder:class");

    private static int loop = 0;

    static {

        SimpleTimer.addPeriodicEvent("ProtocolDecoder:timeouts", 5000, new TimerEventPerformer() {
            public void perform(TimerEvent ev) {

                loop++;

                List<ProtocolDecoder> copy;

                try {
                    class_mon.enter();

                    if (loop % LOG_TICKS == 0) {

                        if (Logger.isEnabled()) {

                            if (decoders.size() > 0) {

                                Logger.log(new LogEvent(LOGID, "Active protocol decoders = " + decoders.size()));
                            }
                        }
                    }

                    copy = new ArrayList<ProtocolDecoder>(decoders);

                } finally {

                    class_mon.exit();
                }

                if (copy.size() > 0) {

                    List<ProtocolDecoder> to_remove = new ArrayList<ProtocolDecoder>();

                    long now = SystemTime.getCurrentTime();

                    for (ProtocolDecoder decoder : copy) {

                        if (decoder.isComplete(now)) {

                            to_remove.add(decoder);
                        }
                    }

                    if (to_remove.size() > 0) {

                        try {
                            class_mon.enter();

                            for (ProtocolDecoder decoder : to_remove) {

                                decoders.remove(decoder);
                            }
                        } finally {

                            class_mon.exit();
                        }
                    }
                }
            }
        });

    }

    protected ProtocolDecoder(boolean run_timer) {
        if (run_timer) {

            try {
                class_mon.enter();

                decoders.add(this);

            } finally {

                class_mon.exit();
            }
        }
    }

    public abstract boolean isComplete(long now);

    public abstract TransportHelperFilter getFilter();

    public static void addSecrets(byte[][] secrets) {
        ProtocolDecoderPHE.addSecretsSupport(secrets);
    }

    public static void removeSecrets(byte[][] secrets) {
        ProtocolDecoderPHE.removeSecretsSupport(secrets);
    }
}
